The Therapy Ball self-massage balls are made from a special rubber that allows you to work out adhesions and tension, ultimately offering an exceptional deep tissue massage experience. The self-massage balls themselves offer great strength and grip to help you penetrate through layers of skin and muscle and target difficult-to-reach areas. Pain conditions that can be improved with a set of Therapy Ball include TMJ/tight jaw, frozen shoulder, sciatica & back pain, IT band syndrome, migraine headaches and more. Enhance your existing self-care routine, relieve yourself of physical discomfort, and begin to live more comfortably in your body with a set of Therapy Ball self-massage balls from Tune Up Fitness. Will be softer after some time using them. These Roll Model massage balls are a safe and easy way for you to perform self-myofascial release (self-massage) techniques from the comfort of your home or office. By using the ALPHA Ball TWIN set for targeted self-massage, you can access areas that hold pain and begin your journey toward lasting relief. The ball itself features a soft top layer and a dense inner core that allows you to work over and around bony areas. Use them in their custom designed snug-grip mesh tote for spine rolls (top of the neck, down to the sacrum), Use them in combination with personal training, Yoga Tune Up, or massage therapy for maximum benefit. They can easily be worked into your self-care fitness regime so you can use them to fit your needs. Whether you need to improve your athletic performance or address posture issues that come from sitting at a desk, you will be glad you purchased these yoga massage balls. Their small size and convenient tote bag make them perfect for on-the-go use. Take your health into your own hands with this pair of Yoga Tune Up® Therapy Balls. 8,9 cm.